There are only official system requirements on the site which are released by developers or an official publisher.

Minimum system requirements:

Recommended system requirements:

CPU:

Pentium®4 2.4 GHz or Athlon XP equivalent

CPU:

Pentium Intel Pentium®4 3.0 GHz or Athlon XP/64bit Equivalent

RAM:

512 MB system Memory

RAM:

2048 MB system Memory

GPU:

GeForce 6600GT 128 MB or similar

GPU:

GeForce 7900GTX 256 MB; ATI Radeon X1900XT 256 MB or higher

DX:

DirectX 9.0c

DX:

DirectX 9.0c

OS:

Microsoft Windows XP (admin rights required) or Windows 2000;
Windows 95/98/ME/NT4 are no longer supported.
The Fate of Hellas also runs on Vista but do not fully support all its new features http://gamesystemrequirements.com/

OS:

Microsoft Windows XP (admin rights required) or Windows Vista
Windows 95/98/ME/NT4 are no longer supported.
The Fate of Hellas also runs on Vista but do not fully support all its new features